I'm not sure if you're talking about the entire ride from Eugene, which I can't speak for, but just after passing McKenzie Bridge (I think) you can get on the old McKenzie Pass, which is beautiful and takes you all the way to Sisters. It has no shoulder either, but it's so twisty and narrow that cars really don't travel all that fast. The route of the Cascade Classic used to include the west face of this road, which made for a great race, and I rode it a few times in training as well when it was open to traffic. No problems. Give it a shot next summer, it's worth it.
Side note, though. They don't plow the road, so it doesn't open until all of the snow has melted. Could be as late as June.